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Segment Information Segment Information Textual (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 segment | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |
Number of Reportable Segments | 7 us-gaap_NumberOfReportableSegments |
Investment in Real Estate Ventures, at equity | $ 233,478 us-gaap_EquityMethodInvestments | $ 225,004 us-gaap_EquityMethodInvestments
Coppell Associates [Member] |  |
Segment Reporting Information [Line Items] |  |
Investment in Real Estate Ventures, at equity | $ (1,200)us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_CoppellAssociatesMember | $ (1,200)us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_CoppellAssociatesMember
Durham, NC [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of Real Estate Properties | 1 us-gaap_NumberOfRealEstateProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bdn_DurhamNCMember |
1000 Atrium Way and Libertyview [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of Real Estate Properties |  | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_BusinessAcquisitionAxis = bdn_A1000AtriumWayandLibertyviewMemberMember
New Jersey/ Delaware [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of Real Estate Properties | 5 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementGeographicalAxis = bdn_NewJerseyDelawareMember |
CALIFORNIA |  |
Segment Reporting Information [Line Items] |  |
Number of Real Estate Properties | 1 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementGeographicalAxis = stpr_CA |

X
- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
Name: | us-gaap_EquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=bdn_A1000AtriumWayandLibertyviewMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_DurhamNCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_CoppellAssociatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=bdn_NewJerseyDelawareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |